After ending down for most of the week, all three main indices in the U.S. ended the day in the green. The Justice Department is preparing to sue Citigroup (C) over the bank's sale of mortgage-backed securities. The Justice Department could file the lawsuit as early as next week. P.F. Chang's is the most recent company to confirm that they suffered from a security breach. The restaurant is advising that all recent customers be vigilant about checking their bank statements and credit card activity. Wholesale prices fell for the first time since February, falling 0.2%.